设置pom引用

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <groupId>com.itstudy</groupId>
<artifactId>demo</artifactId>
<version>1.0.0-SNAPSHOT</version> <name>demo</name> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent> <dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.30</version>
</dependency> </dependencies> <build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

2.增加配置类

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
import org.springframework.http.converter.StringHttpMessageConverter;
import java.nio.charset.Charset; @Configuration
public class RestTemplateConfig { @Bean
public RestTemplate restTemplate(ClientHttpRequestFactory factory){
RestTemplate restTemplate= new RestTemplate(factory);
// 支持中文编码
restTemplate.getMessageConverters().set(1,
new StringHttpMessageConverter(Charset.forName("UTF-8")));
return restTemplate; } @Bean
public ClientHttpRequestFactory simpleClientHttpRequestFactory(){
SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
factory.setReadTimeout(5000);//单位为ms
factory.setConnectTimeout(5000);//单位为ms
return factory;
}
}

3.在service中使用

import com.alibaba.fastjson.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.web.client.RestTemplate; public class RestTestService { @Autowired
private RestTemplate restTemplate; public void test(){ String paras = "data";
String url="http://127.0.0.1"; HttpHeaders headers = new HttpHeaders();
MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
headers.setContentType(type);
headers.add("Accept", MediaType.APPLICATION_JSON.toString());
JSONObject jsonObj = JSONObject.parseObject(paras);
HttpEntity<String> formEntity = new HttpEntity<String>(jsonObj.toString(), headers);
String result = restTemplate.postForObject(url, formEntity, String.class);
} public void testExchage(){ String url=""; HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON_UTF8)); Map<String,String> postData = new HashMap<String,String>();
postData.put("param1","");
postData.put("param2","abc"); //发送json字符串
String content = JSON.toJSONString(postData); HttpEntity<String> httpEntity = new HttpEntity<String>(content, httpHeaders); try { ResponseEntity<String> responseEntity =
restTemplate.exchange(url, HttpMethod.POST, httpEntity, String.class); Map<String,String> mapResponse = JSON.parseObject(responseEntity.getBody(),HashMap.class); }catch (Exception ex){
//进行错误处理
}
} public void testExchage2(){ String url=""; HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON_UTF8)); //参数放入一个map中,restTemplate不能用hashMap
MultiValueMap<String,String> param = new LinkedMultiValueMap<String, String>();
//将请求参数放入map中
param.add("param1","abc");
param.add("param2",""); //将参数和header组成一个请求
HttpEntity<MultiValueMap<String,String>> httpEntity = new HttpEntity<MultiValueMap<String,String>>(param,headers); try {
ResponseEntity<String> responseEntity =
restTemplate.exchange(url, HttpMethod.POST, httpEntity, String.class); //responseEntity.getBody()进行其它处理 }catch (Exception ex){
//进行错误处理
}
}
}

4.应用启动

import org.springframework.boot.Banner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication
public class App { public static void main(String[] args) { SpringApplication app = new SpringApplication(App.class);
//关闭banner
app.setBannerMode(Banner.Mode.OFF);
app.run(args);
} }

另外注意RestTemplate默认 如果返回状态不是200则会报错,因此这个要进行捕获

/判断接口返回是否为200
public static Boolean ping(){
String url = domain + "/it/ping";
try{
ResponseEntity<String> responseEntity = template.getForEntity(url,String.class);
HttpStatus status = responseEntity.getStatusCode();//获取返回状态
return status.is2xxSuccessful();//判断状态码是否为2开头的
}catch(Exception e){
return false; //502 ,500是不能正常返回结果的,需要catch住,返回一个false
}
}

或者进行自定义处理

import java.io.IOException;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.ResponseErrorHandler;
import org.springframework.web.client.RestTemplate; @Configuration
public class RestTemplateConfig {
    
    @Bean
    public RestTemplate restTemplate(ClientHttpRequestFactory factory) throws Exception {
        RestTemplate restTemplate = new RestTemplate(factory);
        ResponseErrorHandler responseErrorHandler = new ResponseErrorHandler() {
            @Override
            public boolean hasError(ClientHttpResponse clientHttpResponse) throws IOException {
                return true;
            }
            @Override
            public void handleError(ClientHttpResponse clientHttpResponse) throws IOException {             }
        };
        restTemplate.setErrorHandler(responseErrorHandler);
        return restTemplate;
    }
    
    @Bean
    public ClientHttpRequestFactory simpleClientHttpRequestFactory(){
        SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
        //读取超时5秒
        factory.setReadTimeout();
        //连接超时15秒
        factory.setConnectTimeout();
        return factory;
    }
}

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